Statement–Assumption — “The Net has many useless sites; www.bigwaste.com is one of them—the difference is, it openly admits being a big waste of time.” Assumptions: I. Most websites claim to be useful even when they are not. II. The Net has no mechanism to distinguish useless sites from useful ones.

Introduction / Context:
The sentence contrasts “many useless sites” with one site that uniquely admits its uselessness. We must see whether it relies on strong claims about the majority of sites or about the absence of filtering mechanisms.

Given Data / Assumptions:

• There are “many” useless sites (not necessarily “most”).
• Bigwaste’s distinct feature is self-admission.
• No claim is made about discovery mechanisms or platform governance.

Concept / Approach:
To be implicit, a claim must be essential. The observation works if merely “many” sites are useless and some of them do not admit it. It does not require “most” to be deceptive, nor that the Net lacks ways to separate good from bad.

Step-by-Step Solution:
1) Assumption I (“most sites claim to be useful even when they are not”) is an overreach. The contrast requires only that Bigwaste’s candid labeling is unusual, not that a majority are deceitful. Hence I is not necessary.2) Assumption II (no mechanism exists) is also unnecessary; the statement comments on sites’ self-representation, not on search/ranking systems.

Verification / Alternative check:
The point stands even if curation tools or reviews exist—the novelty is Bigwaste’s self-description.

Why Other Options Are Wrong:
I-only/Either/Both imply stronger environment-wide claims; II-only implies an infrastructure judgment absent from the sentence.

Common Pitfalls:
Reading “many” as “most,” and importing debates about moderation/filtering not referenced by the statement.

Final Answer:
if neither I nor II is implicit.